Παραπομπή APA

Hoel, P. G., Port, S. C., & Stone, C. J. (1991). Introduction to probability theory. Univrsal.

Παραπομπή Chicago Style

Hoel, Paul Gerhard, Sidney C. Port, και Charles Joel Stone. Introduction to Probability Theory. New Delhi: Univrsal, 1991.

Παραπομπή MLA

Hoel, Paul Gerhard, et al. Introduction to Probability Theory. Univrsal, 1991.